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Leases - Schedule of Rent Expense (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Rent Expense [Abstract]      
Minimum rentals $ 293us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 271us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 286us-gaap_OperatingLeasesRentExpenseMinimumRentals
Contingent rentals 146us-gaap_OperatingLeasesRentExpenseContingentRentals 148us-gaap_OperatingLeasesRentExpenseContingentRentals 161us-gaap_OperatingLeasesRentExpenseContingentRentals
Rent expense $ 439us-gaap_OperatingLeasesRentExpenseNet $ 419us-gaap_OperatingLeasesRentExpenseNet $ 447us-gaap_OperatingLeasesRentExpenseNet